marlfchal



'Och l5, 1929. A. MARICHAL y 1,731,311

x s'rovn Filedoct. 25. 1928 2 sheets-sheet 2 Alm l f9.5 MH. Uyl: 1|- 11 y mmm l lll! v-io i 30 mitted through the grate.

Patented Oct. .15, 1929 UNITED l STATES? ANDR MARICHAI., or BnUssms, BELGrUM strovn Appiieation mea october 2s, 192s, serial No.

This invention relates to coal burning j stoves land like heating apparatus andimore particularly to household stoves of the continuous fire type. It has for its object to provide a stove of this kind that will be economical in operation and adapted to burn for any length of time at a slow or brisk rate as de sired, further objects being to provide a stove easy to control and capable of passing rapidly from slow to quick combustion or vice versa.' To this end the stove according to my invention is so arranged that the charge of fuel contained therein is divided into two concentric zones, one of which forms a shallow annular bed of continuously burning fuel while the other, located centrally, comprises the main body of fuel and only partakes in the combustion when air is admitted thereto and ceases to burn when such air is cut E.

Broadly stated, my improved stove comn prises a bottom grate having a central portion adapted to be shut oil' from the air supply, a shallow fire pot or pan surrounding this grate and a second pot of smaller diameter arranged concentrically thereto above the grate7 so that coal moving downwardly through such upper pot will spread on the grate and form in the lower pot a shallow ring-shaped bed easily permeable' to air ad- Centrally of the grate I may arrange a solid block of metal or refractory material which projects upwardly into the charge of fuel in the upper pot, said block being provided with notches or grooves for feeding air admitted through the central portion of the grate when desired. This block owever may be dispensed withl in small stoves. l

These and other features of my improved stove will be more fully described hereinafter, with reference to the accompanying drawings in which I have illustrated7 by way of example, a continuous fire stove according to this invention.

Fig. 1 shows the complete stove in sectional elevation. i

Fig. 2 is a side view ofthe notched block. Fig. 3 is a side View of the'lower fire pot. Fig. 4 is a plan view of the grate support go and v y i 314,491, and in- Belgium November 5, 1927.

Fig. 5 is a side view of the seat for said support.

The stove illustrated is provided at the top with a fuel hopper or receptacle 1. The coal gradually sinking through the open bottom of this hopper, is directed by a funnel 2 into the upper cylindrical pot 3 and spreads on a frusto-conical grate surrounded with anl upwardly flaring wall 4 which forms the lower pot or pan. The grate comprises two concentric portions 5, 6 resting on a support 7 having a tubular centre portion 8 which forms an air inlet for the centre grate 5 and is provided with a suitable valve 9.

The lowerpot 4 is wider than the upper 65' pot 3 so that between them the coal spreads on the outer grate 6 in the form of a shallow annular bed 10 through which the air let in through said grate can freely pass.

When lthe valve 9 is closed, the combustion 70 does not extend beyond this bed 10, the tirel burns slowly and the bed of fuel 11 contained in the pot 3 gets no air and does not burn. The combustion gases then escape be tween the top edge of the pan 4 and the bot- 75 v tom edge of the pot 3.

- On the valve 9 being opened, air admitted through the tubular passage 8 enters the fuel iA bed 11 both through the centre grate 5 and throughpnotches 1-2 provided in a block 13 8O (Figsl and 2) projecting centrally into the fuel bed 11. From theannular bed 10 combustion then spreads to the fuel adjacent the grate 5 and thence to the whole of the bed 11 contained in the pot, the combustion gases ,'35 from said bed escaping at 14 between the upper edge of said pot and the funnel 2. The 4 fuel 15 contained in the funnel 2 is not subjected to any draft so that it seals off the supply of fuel in the hopper 1 from the incandesoy giant coal and prevents undue extension of the The hopper 1 is surrounded with a casing 16 into which outside air isled through a passage 17 and gets heated before escaping 95 .y

though openings 18. It then mixes with the burnt gases and completes their combustion. The outer structure of the stove comprises a base 19 supporting an outer casing 20 in which are suspended, as shown in Fig. 1, lthe wev hopper 1, the funnel 2 and the pot 3 which may be lined with refractory material. The lower pot Il rests on an annular seat 21 on the base 19, and projecting inwardly from under this seat are lugs 22 (Fig. 5) on which rests the grate support 7.

The central portion 8 ofthe support 7 forms a pivot for the grates 5 and 6 which it within one another and can be rotated, for removing the ashes, by suitable means such as a rod having an eye 23 engaging a pin 24 on the outer rate 6. The lower pot 4 can also be rotated y means of a rod orbar 25 guided in an extension 26 ofthe seat 21 and engaging a finger 27 on the pot 4, and this rotation is utilized to lift said pot for the purpose of emptying the stove.

To this end the under edge of the pot 4 is provided with depending cam surfaces 28 Fig. 8) adapted to engage the lugs 22 when the pot is rotated. thus causing same to rise.A

` The rods 23 and 25, which are not fully shown,

and the spindle 29 of the valve 9, are preferably accessible from the outside in order that they may easily be operated when required.

The inner structure of the stove described may also be embodied in other heating appliances, such as kitchen stoves and central heating apparatus, and changes may be made in the construction and arrangement of the em-` bodiment herein illustrated without departing from the scope of the appended claims,

claim:

' 1. In a stove, the combination, with a grate,

of al shallow annular wall surrounding said grate,.an annular wall of smaller diameter above said grate, a gas outlet between said walls, a further gas outlet above the wall of smaller diameter, andl means for controlling the admission of air into the space confined by said wall of smaller diameter. A 2. In a stove, the combination, with a grate, of a lower pot surrounding said grate," an upper pot above said grate and a feeding hopper above said upper pot, said hopper communieating with said lower pot through said upper pot, a gas outlet between said pots, a further gas outlet between said upper pot and said hopper, and means for controlling the admission of air into said upper pot.

3. In' a stove, the combination of a frustoconical grate comprising a central portion and an annularouter portion, a shallow pot surrounding said grate, a narrower pot above said grate, an annular gas outlet between the top edge of said shallow pot and the bottom edge of said narrower pot; a further gas outlet above the top of said narrower pot, and means for controlling the admission of air through the central portion of said grate. 4. In a stove, the combination with a grate for supporting a body of fuel, of walls for confining said body laterally, said walls comprising a shallow bottom section surrounding said grate, a narrowerintermediate section pan .vide

- air into said vmunicating with. said gas outlets,

feeding air to the central portion of saidV grate and to the grooves in said block, a valve in said passage, an upwardly flaring pan sur- ,1

rounding said grate, a pot of smaller diameterthan said pan suspended above said grate, an annular gas outlet between the upper edge of said pan and the lower edge of said pot, a hopper for feeding fuel to said pot, and an annular gas outlet between the upper edge of i said lpot and the lower edge of said hopper.

6. In a stove, the combination of a casing, a grate in the bottom part of said easing, a shallow ture sus ended in said casing comprising a feeding opper and a pot under said hopper, said pot being ofsnraller diameter than said annular gas outlets respectively probetween said pan and said pot and between said ypot and said hopper, and means for controlling the admission of air intosaid pot through the central portion of said grate.

7. In -a stove, the combination of an outer casing, a grate in the bottom part of said casing, a shallow pan surrounding said grate, a feeding hopper in the top part of said casing, a pot intermediate said hopper and said pan, said pot bein narrower than said pan, means for control ing the admission of pot through the central portion of said grate, annular gas outlets respectively provided between said pan and said pot and between said pot and said hopper, an inner casing surrounding said hopper, a gas flue between said outer and inner casings com` an air inlet for said inner easing, and a connection between said inner casing and said flue.

8. In a stove, the combination of a support having a tubular centre portion, a frustoconical grate rotatable on said support, the tubular portion of said support forming an air inlet passage for the central portion of said grate, a valve for controlling the How of air through said passage, an annular seat surrounding said grate,1a shallow pan rotatable on said seat, means for lifting said pan comprising cooperating lugs and cam surfaces Von said seat and pan respectivel a feeding hopper, a pot intermediate sai 'hopper and pan, said pot being narrower than said and annular gas outlets respectively provided between said pan and said pot and between said pot and said hopper.

9. In a stove, the combination in a easing of pan surrounding said grate, a struca grate for supporting a body of fuel, Walls for confining said body laterally comprising a shallow bottom section surrounding said grat@ a narrower intermediate section above said grate and a top section forming@ feeding hopper, annular gas outlets between said Sueeessive sections, n gas flue communicating with said outlets, an air inlet opening into said flue, means for controlling the admission of air through said grate into said intermediate section, means for rotating Said grate and means for rotating and lifting said bottom section.

In testimony whereof I aix my signature.

ANDR MARICHAL. 

